This shows Feldman tried to deceive the jury (again) by implying the source of the orange fibers came from this apparel when he could have had that type of clothing tested to "prove" it. He didn't because he knew darn well those clothes weren't the source.
The prosecution however, was the first to bring up this evidence which without a source and without the source being "specific" to DW's enviornment is circumstantial evidence that is also deciving.